Ternary cadmium zinc sulphide films with high charge mobilities

Ampong, Francis Kofi; Awudza, Johannes A. M.; Nkum, R.K.; Boakye, F.; Thomas, P. John; O’Brien, Paul

doi:10.1016/j.solidstatesciences.2014.12.013

Cited by 18 publications

(11 citation statements)

References 24 publications

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“…3. Earlier reports have reviewed a nanostructured film with Cd 0.9 Zn 0.1 S hexagonal and Cd 0.5 Zn 0.5 S polytypic or cubic form existing in the hexagonal phase, while Cd 0.1 Zn 0.9 S shows the cubic phase [1,2,43].…”

Section: Resultsmentioning

confidence: 99%

“…Thin films of Cd 1-x Zn x S are interesting because their properties lie between those of ZnS and CdS [1][2][3][4][5]. It is considered a relatively useful transparent metal sulfide, for use as a window in photovoltaic cells.…”

Section: Introductionmentioning

confidence: 99%

“…It is considered a relatively useful transparent metal sulfide, for use as a window in photovoltaic cells. It has a lower absorbance in the UV with band gaps typically in excess of * 2.4 eV [1,[5][6][7][8]. There is also a relatively small lattice mismatches to CdS/CdTe or CIGS cells (Supporting Information; Table S6 and Figure S13) [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The final thickness of the film is determined by the precursor used, the concentration of the precursors, the solvent viscosity and the spinning parameters (speed, time). In a related CBD study, Ampong et al [1] reported a ternary alloy with a hexagonal (wurtzite) structure and a wider band gap than a CdS film [2,8]. The two most common phases for CdS and ZnS are the wellknown hexagonal (greenockite) CdS and the cubic zincblende (sphalerite) [38].…”

Section: Introductionmentioning

confidence: 99%

“…Cadmium sulfide is more stable as the hexagonal (wurtzite structure). Singh [1] concluded that the optical band gap mirrors the structural changes in Cd-rich samples, notwithstanding overall the introduction of small quantities of Zn, which leads to a systematic shrinkage of the hexagonal lattice (up to 12% Zn).…”

Section: Introductionmentioning

confidence: 99%

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The deposition of thin films of cadmium zinc sulfide Cd1−x Zn x S at 250 °C from spin-coated xanthato complexes: a potential route to window layers for photovoltaic cells

2017

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Thin films of Cd 1-x Zn x S (CZS) were prepared by a novel spin coating/melt method from cadmium ethylxanthato [Cd(C 2 H 5 OCS 2 ) 2 ] and zinc ethylxanthato [Zn(C 2 H 5 OCS 2 ) 2 ] in x ratios of 0-0.15 and of 1. A solution of the precursor(s) in THF was spin coated onto a glass substrate and then heated at 250°C for 1 h under N 2 . The thickness of the film formed can be controlled by varying the solution composition and/or the spin rate of the coating. A total metal precursor solution concentration of 50 mM was used in all cases. The films were characterized by p-XRD, SEM, EDX, ICP-AES, XPS, UV-Vis absorption spectroscopy, Raman spectroscopy and resistivity measurements. The band gaps of the films were between 2.35-2.58 and 3.75 eV (0 B x B 0.15 and at x = 1). The resistivity of Cd 1-x Zn x S films was found to vary linearly with zinc contents, and the properties of the films suggest potential application to photovoltaics as window layers. This work is the first study to demonstrate Cd 1-x Zn x S thin films by a spin coating/melt method from xanthato precursors.

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Section: Resultsmentioning

confidence: 99%